Question

A force $F$ is needed to break a copper wire having radius $R$. The force needed to break a copper wire of radius $2R$ will be

• A. $2F$
• B. $4F$
• C. $F/2$
• D. $F/4$

Answer 1

The correct option is B $4F$

Breaking Force $\propto$ Area of cross section of wire $\pi r^2$
If radius of wire is double then breaking force will become four times.